Question

State the second law of motion. Calculate the amount of force required to increase the velocity from $5$ to $25m/s$ in $2sec$. For a scooter having mass $80kg$.

Answer 1

Newton's second law of motion can be formally stated as follows:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

$a=\frac{F_{net}}{m}$

ie,

$F_{net}=m\times a$

$F=\frac{m(v-u)}{\Delta t}=\frac{80(25-5)}{2}=800N$